CN204696252U - A kind of dendroid earth electrode - Google Patents

Abstract

A dendritic grounding electrode, comprising a ring-shaped grounding body, four horizontal ray electrodes are arranged on the ring-shaped grounding body, and a dendritic electrode is arranged at the end of the horizontal electrodes, and the ring-shaped grounding body, the horizontal electrodes, and the dendritic electrodes are located on the same plane Above, the dendritic electrode is composed of three terminal electrodes with equal lengths, and the terminal electrodes on both sides form an included angle of 60 degrees with the terminal electrode in the middle. The utility model can effectively improve the impact characteristics of the grounding body and reduce the impact grounding resistance; it is easy to manufacture and convenient in construction, avoiding the construction difficulties caused by blindly increasing the length of the grounding electrode, and can also achieve a good effect of reducing resistance; The dendritic electrode is installed at the end, on the one hand, the diffusion channel is increased to promote the diffusion, and on the other hand, the electric field at the end of the horizontal ray electrode is distorted to promote the diffusion at the end, which is equivalent to increasing the effective length of the grounding body and promoting the diffusion process. The spark effect in the ground can achieve the purpose of reducing the impact grounding resistance.

Description

a dendritic ground electrode

technical field

The utility model relates to the technical field of electrical grounding, in particular to a dendritic grounding electrode.

Background technique

In the construction of wind farms, grounding devices for discharging lightning current are usually installed. Impulse grounding resistance is an important parameter in the lightning protection grounding design of wind farms. Reducing the impact grounding resistance of wind turbines can significantly improve the lightning protection level of wind turbines. Since wind turbines are often built in arid areas with high soil resistivity, in the research on the grounding electrical performance of wind turbines, the main problem that has existed for a long time is that the grounding resistance of wind turbines is relatively high under high soil resistivity. Not obvious, the level of lightning protection of wind turbines is low.

In order to ensure the normal and safe operation of the wind turbine and the personal safety of the staff, the wind turbine is usually equipped with a grounding device for discharging lightning current. The wind turbine should be connected to the grounding device through the grounding down conductor. The grounding device should be buried Below the ground surface, the grounding resistance of the grounding device directly affects the lightning protection level of the wind turbine. The acceptance of the grounding device is still based on whether the power frequency grounding resistance is qualified or not. The spark effect and inductance effect will be generated during the current dissipation process. At this time, the power frequency characteristics cannot truly reflect the lightning protection effect of the grounding device, and the impact characteristics of the grounding electrode need to be considered. In areas with high soil resistivity, the current dissipating ability is poor, and the impact grounding resistance is high, which poses a threat to the normal and safe operation of the wind farm and the personal safety of the staff.

In the construction of wind farms, in order to reduce the grounding resistance of wind turbines, measures are usually taken to reduce the grounding resistance by interconnecting the grounding devices of multiple wind turbines, grounding modules, expanding the area of the ground grid, and external grounding. However, in the actual construction process, due to the increase in the height of the wind turbine tower, the distance between adjacent wind turbines is relatively long, and the direct interconnection of multiple wind turbine grounding devices will increase the cost, and the grounding project will often be limited by the grounding area. Reduce the grounding resistance by enlarging the area of the grounding grid and conducting external grounding.

Utility model content

The technical problem to be solved by the utility model is to provide a dendritic grounding electrode for the deficiencies of the above-mentioned prior art.

In order to achieve the above object, the technical solution of the utility model is: a dendritic grounding electrode, including a ring-shaped grounding body, four horizontal ray electrodes are arranged on the ring-shaped grounding body, and a dendritic electrode is arranged at the end of the horizontal electrodes. The ring-shaped grounding body, the horizontal electrode, and the dendritic electrode are located on the same plane. The dendritic electrode is composed of three terminal electrodes with equal lengths, and the terminal electrodes on both sides form an included angle of 60 degrees with the terminal electrode in the middle.

The included angle between the horizontal ray electrodes is 90 degrees, which is equivalent to an additional diffusion channel, and the current increases and decreases faster, reducing the inductance of the electrodes themselves, promoting the diffusion, and increasing the distance between adjacent ray electrodes. The distance can reduce the shielding effect and promote the diffusion of current in the soil.

The ratio of the length of the annular grounding body, the horizontal ray electrode, and the terminal electrode is 5:5:2, which satisfies the effective length requirement of the grounding electrode while meeting the power frequency grounding resistance, and can reduce the effect of the electrode's own inductance, so that The drag reduction effect is optimized.

Adopting the above-mentioned structure, the utility model can effectively improve the impact characteristics of the grounding body and reduce the impact grounding resistance; it is easy to manufacture and convenient in construction, avoiding the construction difficulties caused by blindly increasing the length of the grounding electrode, and can also achieve a good effect of reducing resistance At the same time, installing a dendritic electrode at the end increases the diffuse flow channel on the one hand to promote the diffuse flow, and on the other hand distorts the electric field at the end of the horizontal ray electrode to promote the diffuse flow at the end, which is equivalent to increasing the effective length of the grounding body. Promote the spark effect in the process of dispersing the flow, and achieve the purpose of reducing the impact grounding resistance.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Fig. 1 is the structural representation of the utility model.

Detailed ways

As shown in Figure 1, a dendritic grounding electrode includes an annular grounding body 1, four horizontal ray electrodes 2 are arranged on the annular grounding body 1, and a dendritic electrode 3 is arranged at the end of the horizontal electrode 2, and the annular grounding body 1 is provided with a dendritic electrode 3. The body 1, the horizontal electrode 2, and the dendritic electrode 3 are located on the same plane. The dendritic electrode 3 is composed of three terminal electrodes 4 of equal length, and the terminal electrodes 4 on both sides and the terminal electrode 4 in the middle form an angle of 60 degrees. .

The included angle between the horizontal ray electrodes 2 is 90 degrees, which is equivalent to an additional diffusion channel, and the current increases and decreases faster, reducing the inductance of the electrodes themselves, promoting the diffusion, and increasing the size of the adjacent ray electrodes. The distance between them can reduce the shielding effect and promote the diffusion of current in the soil.

The ratio of the length of the annular grounding body 1, the horizontal ray electrode 2, and the terminal electrode 4 is 5:5:2, which satisfies the effective length requirement of the grounding electrode while meeting the power frequency grounding resistance, and can reduce the inductance of the electrode itself. function to optimize the drag reduction effect.

Adopting the above-mentioned structure, the utility model can effectively improve the impact characteristics of the grounding body and reduce the impact grounding resistance; it is easy to manufacture and convenient in construction, avoiding the construction difficulties caused by blindly increasing the length of the grounding electrode, and can also achieve a good effect of reducing resistance At the same time, a dendritic electrode is installed at the end. On the one hand, it increases the diffuse flow channel to promote the diffuse flow. On the other hand, it distorts the electric field at the end of the horizontal ray electrode and promotes the diffuse flow at the end. The spark effect in the process of dispersing flow can achieve the purpose of reducing the impact grounding resistance.

Claims (3)

1. A dendritic grounding electrode, comprising a ring-shaped grounding body (1), characterized in that four horizontal ray electrodes (2) are arranged on the ring-shaped grounding body (1), and tree branches are arranged at the ends of the horizontal electrodes (2) shaped electrode (3), the annular grounding body (1), horizontal electrode (2), and dendritic electrode (3) are located on the same plane, and the dendritic electrode (3) consists of three terminal electrodes (4) of equal length Composition, the terminal electrodes (4) on both sides and the terminal electrode (4) in the middle form an included angle of 60 degrees. 2. The dendritic ground electrode according to claim 1, characterized in that: the angle between the horizontal ray electrodes (2) is 90 degrees. 3. A dendritic grounding electrode according to claim 1, characterized in that: the ratio of the lengths of the annular grounding body (1), the horizontal ray electrode (2), and the terminal electrode (4) is 5:5:2 .